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Old 04 January 2013, 14:48   #1
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Drawbar Material 60mm box ???

Hi, I'm looking to extend a trailer drawbar by replacing the drawbar with 60mm box steel and then bolting on a hitch that fits over 60mm.

I have a steel supplier close to me but not sure what to ask for and what thickness e.g. type of steel and wall thickness.

Any ideas?
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Old 04 January 2013, 15:01   #2
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60 x 60 x thickness (prob 5mm) x [length you need] RHS (Rectangular hollow Section)
All dimensions to be external.
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Old 04 January 2013, 15:03   #3
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Thanks, is it mild steel?
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Old 04 January 2013, 15:06   #4
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I'd have a go with 3/16" gauge ( wall thickness ) and galvanised. The 60mm box you already know. 1/8 is a bit wafer like and 4/16 you're obviously going to be a 1/4 inch thick. Go bigger than smaller but 3/16 gauge is the one to aim for.
Hope that helps. Take your trailer to your supplier, they'll tell you straight away anyway. And get you the right U-bolts too.......and those have to be stainless, the pain in removing corroded U-bolts is not worth the hassle should you wish to adjust and tinker.
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Old 04 January 2013, 15:09   #5
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The 60mm box will slide into a bigger box section and then bolt through so I guess I will need M10 HT bolts ?
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Old 04 January 2013, 15:12   #6
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Got a photo?
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Old 04 January 2013, 15:14   #7
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The 60mm box will slide into a bigger box section and then bolt through so I guess I will need M10 HT bolts ?
M12
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Old 04 January 2013, 15:14   #8
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Yes and stainless........if it's a sliding fit then may I suggest that you do two vertical and two horizontal alternatively.
That will stop it sniping or hinging. Maybe even a 4cm wide 1mm thick nylon strip onto each flat to take up any slack?
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Old 04 January 2013, 15:17   #9
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I need to unbolt the tractor hitch extend the drawbar with the 60mm box which will fit inside the other box section.
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Old 04 January 2013, 15:18   #10
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Yes and stainless........if it's a sliding fit then may I suggest that you do two vertical and two horizontal alternatively.
That will stop it sniping or hinging. Maybe even a 4cm wide 1mm thick nylon strip onto each flat to take up any slack?
Give the steel a bit of a 'touch' at the bolt holes with a sledge to close up any 'slack' in the sleeving. Or you could squeeze it in a vice.
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Old 04 January 2013, 15:23   #11
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Having seen the pic, I would make the extension section the same dimension as the main spine and use a smaller section of 5mm wall RHS around 600mm long, which fits tightly inside both sections to make the connection.
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Old 04 January 2013, 15:24   #12
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If you run that bar the length of the trailer plus some, then you'd launch without getting the car wet.......or your feet. After extending it on the slip, obviously.
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Old 04 January 2013, 15:25   #13
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Originally Posted by Downhilldai View Post
Having seen the pic, I would make the extension section the same dimension as the main spine and use a smaller section of 5mm wall RHS around 600mm long, which fits tightly inside both sections to make the connection.
I know what you mean but the hitch only fits over 60mm box...
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Old 04 January 2013, 15:27   #14
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If you undo the bolts will the "tractor" hitch come out ?.
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Old 04 January 2013, 15:28   #15
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If you undo the bolts will the "tractor" hitch come out ?.
It will do when I hook it up to the tractor and the other end to the disco
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Old 04 January 2013, 15:30   #16
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But it does looked pinched...
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Old 04 January 2013, 15:33   #17
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Could I not cut the eye off leaving enough material and bolt it through whats left?
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Old 04 January 2013, 15:42   #18
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As it will come out I would find/make a bit of box to go back inside trailer side and extend forwards a good bit. Then sleave the new larger box over the whole lot and bolt it up, remember it needs to be good and strong at this point as the weight and forces will be concentrated on the join.

ps. check out hitch widths also as most use a couple of standard widths.
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Old 04 January 2013, 16:12   #19
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Quote:
Originally Posted by Downhilldai View Post
60 x 60 x thickness (prob 5mm) x [length you need] RHS (Rectangular hollow Section)
60x60 is square (SHS)
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Old 04 January 2013, 16:27   #20
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Looking at the pic I would assume that you'd be hacking the eye of anyway. Then simply slip in your 60x60 SHS. Seems easy.....but there's many a slip twixt cup and the lip.
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